#!/usr/bin/perl -w
  
  use strict;
  
  ## Copyright (c) 1998 Michael Zucchi, All Rights Reserved        ##
  ## Copyright (C) 2000, 1  Tim Waugh <twaugh@redhat.com>          ##
  ## Copyright (C) 2001  Simon Huggins                             ##
  ## 								 ##
  ## #define enhancements by Armin Kuster <akuster@mvista.com>	 ##
  ## Copyright (c) 2000 MontaVista Software, Inc.			 ##
  ## 								 ##
  ## This software falls under the GNU General Public License.     ##
  ## Please read the COPYING file for more information             ##
  
  # w.o. 03-11-2000: added the '-filelist' option.
  
  # 18/01/2001 - 	Cleanups
  # 		Functions prototyped as foo(void) same as foo()
  # 		Stop eval'ing where we don't need to.
  # -- huggie@earth.li
  
  # 27/06/2001 -  Allowed whitespace after initial "/**" and
  #               allowed comments before function declarations.
  # -- Christian Kreibich <ck@whoop.org>
  
  # Still to do:
  # 	- add perldoc documentation
  # 	- Look more closely at some of the scarier bits :)
  
  # 26/05/2001 - 	Support for separate source and object trees.
  #		Return error code.
  # 		Keith Owens <kaos@ocs.com.au>
  
  # 23/09/2001 - Added support for typedefs, structs, enums and unions
  #              Support for Context section; can be terminated using empty line
  #              Small fixes (like spaces vs. \s in regex)
  # -- Tim Jansen <tim@tjansen.de>
  
  
  #
  # This will read a 'c' file and scan for embedded comments in the
  # style of gnome comments (+minor extensions - see below).
  #
  
  # Note: This only supports 'c'.
  
  # usage:

  # kernel-doc [ -docbook | -html | -text | -man ]

  #           [ -function funcname [ -function funcname ...] ] c file(s)s > outputfile
  # or
  #           [ -nofunction funcname [ -function funcname ...] ] c file(s)s > outputfile
  #
  #  Set output format using one of -docbook -html -text or -man.  Default is man.
  #
  #  -function funcname
  #	If set, then only generate documentation for the given function(s).  All
  #	other functions are ignored.
  #
  #  -nofunction funcname

  #	If set, then only generate documentation for the other function(s).
  #	Cannot be used together with -function

  #	(yes, that's a bug -- perl hackers can fix it 8))

  #
  #  c files - list of 'c' files to process
  #
  #  All output goes to stdout, with errors to stderr.
  
  #
  # format of comments.
  # In the following table, (...)? signifies optional structure.
  #                         (...)* signifies 0 or more structure elements
  # /**
  #  * function_name(:)? (- short description)?
  # (* @parameterx: (description of parameter x)?)*
  # (* a blank line)?
  #  * (Description:)? (Description of function)?
  #  * (section header: (section description)? )*
  #  (*)?*/
  #
  # So .. the trivial example would be:
  #
  # /**
  #  * my_function
  #  **/
  #

  # If the Description: header tag is omitted, then there must be a blank line

  # after the last parameter specification.
  # e.g.
  # /**
  #  * my_function - does my stuff
  #  * @my_arg: its mine damnit
  #  *

  #  * Does my stuff explained.

  #  */
  #
  #  or, could also use:
  # /**
  #  * my_function - does my stuff
  #  * @my_arg: its mine damnit

  #  * Description: Does my stuff explained.

  #  */
  # etc.
  #

  # Beside functions you can also write documentation for structs, unions,
  # enums and typedefs. Instead of the function name you must write the name
  # of the declaration;  the struct/union/enum/typedef must always precede
  # the name. Nesting of declarations is not supported.

  # Use the argument mechanism to document members or constants.
  # e.g.
  # /**
  #  * struct my_struct - short description
  #  * @a: first member
  #  * @b: second member

  #  *

  #  * Longer description
  #  */
  # struct my_struct {
  #     int a;
  #     int b;

  # /* private: */
  #     int c;

  # };
  #
  # All descriptions can be multiline, except the short function description.

  #
  # You can also add additional sections. When documenting kernel functions you
  # should document the "Context:" of the function, e.g. whether the functions

  # can be called form interrupts. Unlike other sections you can end it with an

  # empty line.
  # Example-sections should contain the string EXAMPLE so that they are marked

  # appropriately in DocBook.
  #
  # Example:
  # /**
  #  * user_function - function that can only be called in user context
  #  * @a: some argument
  #  * Context: !in_interrupt()

  #  *

  #  * Some description
  #  * Example:
  #  *    user_function(22);
  #  */
  # ...
  #
  #
  # All descriptive text is further processed, scanning for the following special
  # patterns, which are highlighted appropriately.
  #
  # 'funcname()' - function
  # '$ENVVAR' - environmental variable
  # '&struct_name' - name of a structure (up to two words including 'struct')
  # '@parameter' - name of a parameter
  # '%CONST' - name of a constant.
  
  my $errors = 0;
  my $warnings = 0;

  my $anon_struct_union = 0;

  
  # match expressions used to find embedded type information
  my $type_constant = '\%([-_\w]+)';
  my $type_func = '(\w+)\(\)';
  my $type_param = '\@(\w+)';

  my $type_struct = '\&((struct\s*)*[_\w]+)';
  my $type_struct_xml = '\\\amp;((struct\s*)*[_\w]+)';

  my $type_env = '(\$\w+)';
  
  # Output conversion substitutions.
  #  One for each output format
  
  # these work fairly well
  my %highlights_html = ( $type_constant, "<i>\$1</i>",
  			$type_func, "<b>\$1</b>",

  			$type_struct_xml, "<i>\$1</i>",
  			$type_env, "<b><i>\$1</i></b>",

  			$type_param, "<tt><b>\$1</b></tt>" );
  my $blankline_html = "<p>";
  
  # XML, docbook format
  my %highlights_xml = ( "([^=])\\\"([^\\\"<]+)\\\"", "\$1<quote>\$2</quote>",
  			$type_constant, "<constant>\$1</constant>",
  			$type_func, "<function>\$1</function>",
  			$type_struct, "<structname>\$1</structname>",
  			$type_env, "<envar>\$1</envar>",
  			$type_param, "<parameter>\$1</parameter>" );
  my $blankline_xml = "</para><para>
  ";
  
  # gnome, docbook format
  my %highlights_gnome = ( $type_constant, "<replaceable class=\"option\">\$1</replaceable>",
  			 $type_func, "<function>\$1</function>",
  			 $type_struct, "<structname>\$1</structname>",
  			 $type_env, "<envar>\$1</envar>",
  			 $type_param, "<parameter>\$1</parameter>" );
  my $blankline_gnome = "</para><para>
  ";
  
  # these are pretty rough
  my %highlights_man = ( $type_constant, "\$1",
  		       $type_func, "\\\\fB\$1\\\\fP",
  		       $type_struct, "\\\\fI\$1\\\\fP",
  		       $type_param, "\\\\fI\$1\\\\fP" );
  my $blankline_man = "";
  
  # text-mode
  my %highlights_text = ( $type_constant, "\$1",
  			$type_func, "\$1",
  			$type_struct, "\$1",
  			$type_param, "\$1" );
  my $blankline_text = "";
  
  
  sub usage {
      print "Usage: $0 [ -v ] [ -docbook | -html | -text | -man ]
  ";
      print "         [ -function funcname [ -function funcname ...] ]
  ";
      print "         [ -nofunction funcname [ -nofunction funcname ...] ]
  ";
      print "         c source file(s) > outputfile
  ";
      exit 1;
  }
  
  # read arguments
  if ($#ARGV==-1) {
      usage();
  }
  
  my $verbose = 0;
  my $output_mode = "man";
  my %highlights = %highlights_man;
  my $blankline = $blankline_man;
  my $modulename = "Kernel API";
  my $function_only = 0;

  my $man_date = ('January', 'February', 'March', 'April', 'May', 'June',
  		'July', 'August', 'September', 'October',
  		'November', 'December')[(localtime)[4]] .

    " " . ((localtime)[5]+1900);
  
  # Essentially these are globals
  # They probably want to be tidied up made more localised or summat.
  # CAVEAT EMPTOR!  Some of the others I localised may not want to be which
  # could cause "use of undefined value" or other bugs.
  my ($function, %function_table,%parametertypes,$declaration_purpose);
  my ($type,$declaration_name,$return_type);
  my ($newsection,$newcontents,$prototype,$filelist, $brcount, %source_map);

  # Generated docbook code is inserted in a template at a point where

  # docbook v3.1 requires a non-zero sequence of RefEntry's; see:
  # http://www.oasis-open.org/docbook/documentation/reference/html/refentry.html
  # We keep track of number of generated entries and generate a dummy
  # if needs be to ensure the expanded template can be postprocessed
  # into html.
  my $section_counter = 0;
  
  my $lineprefix="";
  
  # states
  # 0 - normal code
  # 1 - looking for function name
  # 2 - scanning field start.
  # 3 - scanning prototype.
  # 4 - documentation block
  my $state;

  my $in_doc_sect;

  
  #declaration types: can be
  # 'function', 'struct', 'union', 'enum', 'typedef'
  my $decl_type;
  
  my $doc_special = "\@\%\$\&";
  
  my $doc_start = '^/\*\*\s*$'; # Allow whitespace at end of comment start.
  my $doc_end = '\*/';
  my $doc_com = '\s*\*\s*';
  my $doc_decl = $doc_com.'(\w+)';

  my $doc_sect = $doc_com.'(['.$doc_special.']?[\w\s]+):(.*)';

  my $doc_content = $doc_com.'(.*)';
  my $doc_block = $doc_com.'DOC:\s*(.*)?';
  
  my %constants;
  my %parameterdescs;
  my @parameterlist;
  my %sections;
  my @sectionlist;
  
  my $contents = "";
  my $section_default = "Description";	# default section
  my $section_intro = "Introduction";
  my $section = $section_default;
  my $section_context = "Context";
  
  my $undescribed = "-- undescribed --";
  
  reset_state();
  
  while ($ARGV[0] =~ m/^-(.*)/) {
      my $cmd = shift @ARGV;
      if ($cmd eq "-html") {
  	$output_mode = "html";
  	%highlights = %highlights_html;
  	$blankline = $blankline_html;
      } elsif ($cmd eq "-man") {
  	$output_mode = "man";
  	%highlights = %highlights_man;
  	$blankline = $blankline_man;
      } elsif ($cmd eq "-text") {
  	$output_mode = "text";
  	%highlights = %highlights_text;
  	$blankline = $blankline_text;
      } elsif ($cmd eq "-docbook") {
  	$output_mode = "xml";
  	%highlights = %highlights_xml;
  	$blankline = $blankline_xml;
      } elsif ($cmd eq "-gnome") {
  	$output_mode = "gnome";
  	%highlights = %highlights_gnome;
  	$blankline = $blankline_gnome;
      } elsif ($cmd eq "-module") { # not needed for XML, inherits from calling document
  	$modulename = shift @ARGV;
      } elsif ($cmd eq "-function") { # to only output specific functions
  	$function_only = 1;
  	$function = shift @ARGV;
  	$function_table{$function} = 1;
      } elsif ($cmd eq "-nofunction") { # to only output specific functions
  	$function_only = 2;
  	$function = shift @ARGV;
  	$function_table{$function} = 1;
      } elsif ($cmd eq "-v") {
  	$verbose = 1;
      } elsif (($cmd eq "-h") || ($cmd eq "--help")) {
  	usage();
      } elsif ($cmd eq '-filelist') {
  	    $filelist = shift @ARGV;
      }
  }

  # get kernel version from env
  sub get_kernel_version() {
      my $version;
  
      if (defined($ENV{'KERNELVERSION'})) {
  	$version = $ENV{'KERNELVERSION'};
      }
      return $version;
  }

  my $kernelversion = get_kernel_version();

  
  # generate a sequence of code that will splice in highlighting information
  # using the s// operator.
  my $dohighlight = "";
  foreach my $pattern (keys %highlights) {

  #   print STDERR "scanning pattern:$pattern, highlight:($highlights{$pattern})
  ";

      $dohighlight .=  "\$contents =~ s:$pattern:$highlights{$pattern}:gs;
  ";
  }
  
  ##
  # dumps section contents to arrays/hashes intended for that purpose.
  #
  sub dump_section {
      my $name = shift;
      my $contents = join "
  ", @_;
  
      if ($name =~ m/$type_constant/) {
  	$name = $1;
  #	print STDERR "constant section '$1' = '$contents'
  ";
  	$constants{$name} = $contents;
      } elsif ($name =~ m/$type_param/) {
  #	print STDERR "parameter def '$1' = '$contents'
  ";
  	$name = $1;
  	$parameterdescs{$name} = $contents;
      } else {
  #	print STDERR "other section '$name' = '$contents'
  ";
  	$sections{$name} = $contents;
  	push @sectionlist, $name;
      }
  }
  
  ##
  # output function
  #
  # parameterdescs, a hash.
  #  function => "function name"
  #  parameterlist => @list of parameters
  #  parameterdescs => %parameter descriptions
  #  sectionlist => @list of sections

  #  sections => %section descriptions

  #

  
  sub output_highlight {
      my $contents = join "
  ",@_;
      my $line;
  
  #   DEBUG
  #   if (!defined $contents) {
  #	use Carp;
  #	confess "output_highlight got called with no args?
  ";
  #   }

  #   print STDERR "contents b4:$contents
  ";

      eval $dohighlight;
      die $@ if $@;

      if ($output_mode eq "html") {
  	$contents =~ s/\\\\//;
      }
  #   print STDERR "contents af:$contents
  ";

      foreach $line (split "
  ", $contents) {

  	if ($line eq ""){

  	    print $lineprefix, $blankline;
  	} else {

  	    $line =~ s/\\\\\\/\&/g;

  	    if ($output_mode eq "man" && substr($line, 0, 1) eq ".") {
  		print "\\&$line";
  	    } else {
  		print $lineprefix, $line;
  	    }

  	}
  	print "
  ";
      }
  }
  
  #output sections in html
  sub output_section_html(%) {
      my %args = %{$_[0]};
      my $section;
  
      foreach $section (@{$args{'sectionlist'}}) {
  	print "<h3>$section</h3>
  ";
  	print "<blockquote>
  ";
  	output_highlight($args{'sections'}{$section});
  	print "</blockquote>
  ";

      }

  }
  
  # output enum in html
  sub output_enum_html(%) {
      my %args = %{$_[0]};
      my ($parameter);
      my $count;
      print "<h2>enum ".$args{'enum'}."</h2>
  ";
  
      print "<b>enum ".$args{'enum'}."</b> {<br>
  ";
      $count = 0;
      foreach $parameter (@{$args{'parameterlist'}}) {

  	print " <b>".$parameter."</b>";

  	if ($count != $#{$args{'parameterlist'}}) {
  	    $count++;
  	    print ",
  ";
  	}
  	print "<br>";
      }
      print "};<br>
  ";
  
      print "<h3>Constants</h3>
  ";
      print "<dl>
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	print "<dt><b>".$parameter."</b>
  ";
  	print "<dd>";
  	output_highlight($args{'parameterdescs'}{$parameter});
      }
      print "</dl>
  ";
      output_section_html(@_);
      print "<hr>
  ";
  }

  # output typedef in html

  sub output_typedef_html(%) {
      my %args = %{$_[0]};
      my ($parameter);
      my $count;
      print "<h2>typedef ".$args{'typedef'}."</h2>
  ";
  
      print "<b>typedef ".$args{'typedef'}."</b>
  ";
      output_section_html(@_);
      print "<hr>
  ";
  }
  
  # output struct in html
  sub output_struct_html(%) {
      my %args = %{$_[0]};
      my ($parameter);

      print "<h2>".$args{'type'}." ".$args{'struct'}. " - " .$args{'purpose'}."</h2>
  ";

      print "<b>".$args{'type'}." ".$args{'struct'}."</b> {<br>
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	if ($parameter =~ /^#/) {
  		print "$parameter<br>
  ";
  		next;
  	}
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function

  	    print "&nbsp; &nbsp; <i>$1</i><b>$parameter</b>) <i>($2)</i>;<br>
  ";

  	} elsif ($type =~ m/^(.*?)\s*(:.*)/) {

  	    # bitfield
  	    print "&nbsp; &nbsp; <i>$1</i> <b>$parameter</b>$2;<br>
  ";

  	} else {

  	    print "&nbsp; &nbsp; <i>$type</i> <b>$parameter</b>;<br>
  ";

  	}
      }
      print "};<br>
  ";
  
      print "<h3>Members</h3>
  ";
      print "<dl>
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	($parameter =~ /^#/) && next;
  
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	print "<dt><b>".$parameter."</b>
  ";
  	print "<dd>";
  	output_highlight($args{'parameterdescs'}{$parameter_name});
      }
      print "</dl>
  ";
      output_section_html(@_);
      print "<hr>
  ";
  }
  
  # output function in html
  sub output_function_html(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;

      print "<h2>" .$args{'function'}." - ".$args{'purpose'}."</h2>
  ";

      print "<i>".$args{'functiontype'}."</i>
  ";
      print "<b>".$args{'function'}."</b>
  ";
      print "(";
      $count = 0;
      foreach $parameter (@{$args{'parameterlist'}}) {
  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function
  	    print "<i>$1</i><b>$parameter</b>) <i>($2)</i>";
  	} else {
  	    print "<i>".$type."</i> <b>".$parameter."</b>";
  	}
  	if ($count != $#{$args{'parameterlist'}}) {
  	    $count++;
  	    print ",
  ";
  	}
      }
      print ")
  ";
  
      print "<h3>Arguments</h3>
  ";
      print "<dl>
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	print "<dt><b>".$parameter."</b>
  ";
  	print "<dd>";
  	output_highlight($args{'parameterdescs'}{$parameter_name});
      }
      print "</dl>
  ";
      output_section_html(@_);
      print "<hr>
  ";
  }
  
  # output intro in html
  sub output_intro_html(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
  
      foreach $section (@{$args{'sectionlist'}}) {
  	print "<h3>$section</h3>
  ";
  	print "<ul>
  ";
  	output_highlight($args{'sections'}{$section});
  	print "</ul>
  ";
      }
      print "<hr>
  ";
  }
  
  sub output_section_xml(%) {
      my %args = %{$_[0]};

      my $section;

      # print out each section
      $lineprefix="   ";
      foreach $section (@{$args{'sectionlist'}}) {

  	print "<refsect1>
  ";
  	print "<title>$section</title>
  ";

  	if ($section =~ m/EXAMPLE/i) {

  	    print "<informalexample><programlisting>
  ";
  	} else {
  	    print "<para>
  ";

  	}
  	output_highlight($args{'sections'}{$section});
  	if ($section =~ m/EXAMPLE/i) {

  	    print "</programlisting></informalexample>
  ";
  	} else {
  	    print "</para>
  ";

  	}

  	print "</refsect1>
  ";

      }
  }
  
  # output function in XML DocBook
  sub output_function_xml(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
      my $id;
  
      $id = "API-".$args{'function'};
      $id =~ s/[^A-Za-z0-9]/-/g;

      print "<refentry id=\"$id\">
  ";

      print "<refentryinfo>
  ";
      print " <title>LINUX</title>
  ";
      print " <productname>Kernel Hackers Manual</productname>
  ";
      print " <date>$man_date</date>
  ";
      print "</refentryinfo>
  ";

      print "<refmeta>
  ";

      print " <refentrytitle><phrase>".$args{'function'}."</phrase></refentrytitle>
  ";

      print " <manvolnum>9</manvolnum>
  ";

      print " <refmiscinfo class=\"version\">" . $kernelversion . "</refmiscinfo>
  ";

      print "</refmeta>
  ";
      print "<refnamediv>
  ";
      print " <refname>".$args{'function'}."</refname>
  ";
      print " <refpurpose>
  ";
      print "  ";
      output_highlight ($args{'purpose'});
      print " </refpurpose>
  ";
      print "</refnamediv>
  ";
  
      print "<refsynopsisdiv>
  ";
      print " <title>Synopsis</title>
  ";
      print "  <funcsynopsis><funcprototype>
  ";
      print "   <funcdef>".$args{'functiontype'}." ";
      print "<function>".$args{'function'}." </function></funcdef>
  ";
  
      $count = 0;
      if ($#{$args{'parameterlist'}} >= 0) {
  	foreach $parameter (@{$args{'parameterlist'}}) {
  	    $type = $args{'parametertypes'}{$parameter};
  	    if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  		# pointer-to-function
  		print "   <paramdef>$1<parameter>$parameter</parameter>)
  ";
  		print "     <funcparams>$2</funcparams></paramdef>
  ";
  	    } else {
  		print "   <paramdef>".$type;
  		print " <parameter>$parameter</parameter></paramdef>
  ";
  	    }
  	}
      } else {

  	print "  <void/>
  ";

      }
      print "  </funcprototype></funcsynopsis>
  ";
      print "</refsynopsisdiv>
  ";
  
      # print parameters
      print "<refsect1>
   <title>Arguments</title>
  ";
      if ($#{$args{'parameterlist'}} >= 0) {
  	print " <variablelist>
  ";
  	foreach $parameter (@{$args{'parameterlist'}}) {
  	    my $parameter_name = $parameter;
  	    $parameter_name =~ s/\[.*//;
  
  	    print "  <varlistentry>
     <term><parameter>$parameter</parameter></term>
  ";
  	    print "   <listitem>
      <para>
  ";
  	    $lineprefix="     ";
  	    output_highlight($args{'parameterdescs'}{$parameter_name});
  	    print "    </para>
     </listitem>
    </varlistentry>
  ";
  	}
  	print " </variablelist>
  ";
      } else {
  	print " <para>
    None
   </para>
  ";
      }
      print "</refsect1>
  ";
  
      output_section_xml(@_);
      print "</refentry>
  
  ";
  }
  
  # output struct in XML DocBook
  sub output_struct_xml(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $id;
  
      $id = "API-struct-".$args{'struct'};
      $id =~ s/[^A-Za-z0-9]/-/g;

      print "<refentry id=\"$id\">
  ";

      print "<refentryinfo>
  ";
      print " <title>LINUX</title>
  ";
      print " <productname>Kernel Hackers Manual</productname>
  ";
      print " <date>$man_date</date>
  ";
      print "</refentryinfo>
  ";

      print "<refmeta>
  ";

      print " <refentrytitle><phrase>".$args{'type'}." ".$args{'struct'}."</phrase></refentrytitle>
  ";

      print " <manvolnum>9</manvolnum>
  ";

      print " <refmiscinfo class=\"version\">" . $kernelversion . "</refmiscinfo>
  ";

      print "</refmeta>
  ";
      print "<refnamediv>
  ";
      print " <refname>".$args{'type'}." ".$args{'struct'}."</refname>
  ";
      print " <refpurpose>
  ";
      print "  ";
      output_highlight ($args{'purpose'});
      print " </refpurpose>
  ";
      print "</refnamediv>
  ";
  
      print "<refsynopsisdiv>
  ";
      print " <title>Synopsis</title>
  ";
      print "  <programlisting>
  ";
      print $args{'type'}." ".$args{'struct'}." {
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	if ($parameter =~ /^#/) {
  	    print "$parameter
  ";
  	    next;
  	}
  
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;
  
  	defined($args{'parameterdescs'}{$parameter_name}) || next;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function
  	    print "  $1 $parameter) ($2);
  ";
  	} elsif ($type =~ m/^(.*?)\s*(:.*)/) {

  	    # bitfield

  	    print "  $1 $parameter$2;
  ";
  	} else {
  	    print "  ".$type." ".$parameter.";
  ";
  	}
      }
      print "};";
      print "  </programlisting>
  ";
      print "</refsynopsisdiv>
  ";
  
      print " <refsect1>
  ";
      print "  <title>Members</title>
  ";
  
      print "  <variablelist>
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
        ($parameter =~ /^#/) && next;
  
        my $parameter_name = $parameter;
        $parameter_name =~ s/\[.*//;
  
        defined($args{'parameterdescs'}{$parameter_name}) || next;
        ($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
        print "    <varlistentry>";
        print "      <term>$parameter</term>
  ";
        print "      <listitem><para>
  ";
        output_highlight($args{'parameterdescs'}{$parameter_name});
        print "      </para></listitem>
  ";
        print "    </varlistentry>
  ";
      }
      print "  </variablelist>
  ";
      print " </refsect1>
  ";
  
      output_section_xml(@_);
  
      print "</refentry>
  
  ";
  }
  
  # output enum in XML DocBook
  sub output_enum_xml(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
      my $id;
  
      $id = "API-enum-".$args{'enum'};
      $id =~ s/[^A-Za-z0-9]/-/g;

      print "<refentry id=\"$id\">
  ";

      print "<refentryinfo>
  ";
      print " <title>LINUX</title>
  ";
      print " <productname>Kernel Hackers Manual</productname>
  ";
      print " <date>$man_date</date>
  ";
      print "</refentryinfo>
  ";

      print "<refmeta>
  ";

      print " <refentrytitle><phrase>enum ".$args{'enum'}."</phrase></refentrytitle>
  ";

      print " <manvolnum>9</manvolnum>
  ";

      print " <refmiscinfo class=\"version\">" . $kernelversion . "</refmiscinfo>
  ";

      print "</refmeta>
  ";
      print "<refnamediv>
  ";
      print " <refname>enum ".$args{'enum'}."</refname>
  ";
      print " <refpurpose>
  ";
      print "  ";
      output_highlight ($args{'purpose'});
      print " </refpurpose>
  ";
      print "</refnamediv>
  ";
  
      print "<refsynopsisdiv>
  ";
      print " <title>Synopsis</title>
  ";
      print "  <programlisting>
  ";
      print "enum ".$args{'enum'}." {
  ";
      $count = 0;
      foreach $parameter (@{$args{'parameterlist'}}) {

  	print "  $parameter";
  	if ($count != $#{$args{'parameterlist'}}) {

  	    $count++;
  	    print ",";

  	}

  	print "
  ";
      }
      print "};";
      print "  </programlisting>
  ";
      print "</refsynopsisdiv>
  ";
  
      print "<refsect1>
  ";

      print " <title>Constants</title>
  ";

      print "  <variablelist>
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
        my $parameter_name = $parameter;
        $parameter_name =~ s/\[.*//;
  
        print "    <varlistentry>";
        print "      <term>$parameter</term>
  ";
        print "      <listitem><para>
  ";
        output_highlight($args{'parameterdescs'}{$parameter_name});
        print "      </para></listitem>
  ";
        print "    </varlistentry>
  ";
      }
      print "  </variablelist>
  ";
      print "</refsect1>
  ";
  
      output_section_xml(@_);
  
      print "</refentry>
  
  ";
  }
  
  # output typedef in XML DocBook
  sub output_typedef_xml(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $id;
  
      $id = "API-typedef-".$args{'typedef'};
      $id =~ s/[^A-Za-z0-9]/-/g;

      print "<refentry id=\"$id\">
  ";

      print "<refentryinfo>
  ";
      print " <title>LINUX</title>
  ";
      print " <productname>Kernel Hackers Manual</productname>
  ";
      print " <date>$man_date</date>
  ";
      print "</refentryinfo>
  ";

      print "<refmeta>
  ";

      print " <refentrytitle><phrase>typedef ".$args{'typedef'}."</phrase></refentrytitle>
  ";

      print " <manvolnum>9</manvolnum>
  ";

      print "</refmeta>
  ";
      print "<refnamediv>
  ";
      print " <refname>typedef ".$args{'typedef'}."</refname>
  ";
      print " <refpurpose>
  ";
      print "  ";
      output_highlight ($args{'purpose'});
      print " </refpurpose>
  ";
      print "</refnamediv>
  ";
  
      print "<refsynopsisdiv>
  ";
      print " <title>Synopsis</title>
  ";
      print "  <synopsis>typedef ".$args{'typedef'}.";</synopsis>
  ";
      print "</refsynopsisdiv>
  ";
  
      output_section_xml(@_);
  
      print "</refentry>
  
  ";
  }
  
  # output in XML DocBook
  sub output_intro_xml(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
  
      my $id = $args{'module'};
      $id =~ s/[^A-Za-z0-9]/-/g;
  
      # print out each section
      $lineprefix="   ";
      foreach $section (@{$args{'sectionlist'}}) {
  	print "<refsect1>
   <title>$section</title>
   <para>
  ";
  	if ($section =~ m/EXAMPLE/i) {
  	    print "<example><para>
  ";
  	}
  	output_highlight($args{'sections'}{$section});
  	if ($section =~ m/EXAMPLE/i) {
  	    print "</para></example>
  ";
  	}
  	print " </para>
  </refsect1>
  ";
      }
  
      print "
  
  ";
  }
  
  # output in XML DocBook
  sub output_function_gnome {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
      my $id;
  
      $id = $args{'module'}."-".$args{'function'};
      $id =~ s/[^A-Za-z0-9]/-/g;
  
      print "<sect2>
  ";
      print " <title id=\"$id\">".$args{'function'}."</title>
  ";
  
      print "  <funcsynopsis>
  ";
      print "   <funcdef>".$args{'functiontype'}." ";
      print "<function>".$args{'function'}." ";
      print "</function></funcdef>
  ";
  
      $count = 0;
      if ($#{$args{'parameterlist'}} >= 0) {
  	foreach $parameter (@{$args{'parameterlist'}}) {
  	    $type = $args{'parametertypes'}{$parameter};
  	    if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  		# pointer-to-function
  		print "   <paramdef>$1 <parameter>$parameter</parameter>)
  ";
  		print "     <funcparams>$2</funcparams></paramdef>
  ";
  	    } else {
  		print "   <paramdef>".$type;
  		print " <parameter>$parameter</parameter></paramdef>
  ";
  	    }
  	}
      } else {
  	print "  <void>
  ";
      }
      print "  </funcsynopsis>
  ";
      if ($#{$args{'parameterlist'}} >= 0) {
  	print " <informaltable pgwide=\"1\" frame=\"none\" role=\"params\">
  ";
  	print "<tgroup cols=\"2\">
  ";
  	print "<colspec colwidth=\"2*\">
  ";
  	print "<colspec colwidth=\"8*\">
  ";
  	print "<tbody>
  ";
  	foreach $parameter (@{$args{'parameterlist'}}) {
  	    my $parameter_name = $parameter;
  	    $parameter_name =~ s/\[.*//;
  
  	    print "  <row><entry align=\"right\"><parameter>$parameter</parameter></entry>
  ";
  	    print "   <entry>
  ";
  	    $lineprefix="     ";
  	    output_highlight($args{'parameterdescs'}{$parameter_name});
  	    print "    </entry></row>
  ";
  	}
  	print " </tbody></tgroup></informaltable>
  ";
      } else {
  	print " <para>
    None
   </para>
  ";
      }
  
      # print out each section
      $lineprefix="   ";
      foreach $section (@{$args{'sectionlist'}}) {
  	print "<simplesect>
   <title>$section</title>
  ";
  	if ($section =~ m/EXAMPLE/i) {
  	    print "<example><programlisting>
  ";
  	} else {
  	}
  	print "<para>
  ";
  	output_highlight($args{'sections'}{$section});
  	print "</para>
  ";
  	if ($section =~ m/EXAMPLE/i) {
  	    print "</programlisting></example>
  ";
  	} else {
  	}
  	print " </simplesect>
  ";
      }
  
      print "</sect2>
  
  ";
  }
  
  ##
  # output function in man
  sub output_function_man(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
  
      print ".TH \"$args{'function'}\" 9 \"$args{'function'}\" \"$man_date\" \"Kernel Hacker's Manual\" LINUX
  ";
  
      print ".SH NAME
  ";
      print $args{'function'}." \\- ".$args{'purpose'}."
  ";
  
      print ".SH SYNOPSIS
  ";

      if ($args{'functiontype'} ne "") {
  	print ".B \"".$args{'functiontype'}."\" ".$args{'function'}."
  ";
      } else {
  	print ".B \"".$args{'function'}."
  ";
      }

      $count = 0;
      my $parenth = "(";
      my $post = ",";
      foreach my $parameter (@{$args{'parameterlist'}}) {
  	if ($count == $#{$args{'parameterlist'}}) {
  	    $post = ");";
  	}
  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function
  	    print ".BI \"".$parenth.$1."\" ".$parameter." \") (".$2.")".$post."\"
  ";
  	} else {
  	    $type =~ s/([^\*])$/$1 /;
  	    print ".BI \"".$parenth.$type."\" ".$parameter." \"".$post."\"
  ";
  	}
  	$count++;
  	$parenth = "";
      }
  
      print ".SH ARGUMENTS
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;
  
  	print ".IP \"".$parameter."\" 12
  ";
  	output_highlight($args{'parameterdescs'}{$parameter_name});
      }
      foreach $section (@{$args{'sectionlist'}}) {
  	print ".SH \"", uc $section, "\"
  ";
  	output_highlight($args{'sections'}{$section});
      }
  }
  
  ##
  # output enum in man
  sub output_enum_man(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
  
      print ".TH \"$args{'module'}\" 9 \"enum $args{'enum'}\" \"$man_date\" \"API Manual\" LINUX
  ";
  
      print ".SH NAME
  ";
      print "enum ".$args{'enum'}." \\- ".$args{'purpose'}."
  ";
  
      print ".SH SYNOPSIS
  ";
      print "enum ".$args{'enum'}." {
  ";
      $count = 0;
      foreach my $parameter (@{$args{'parameterlist'}}) {

  	print ".br
  .BI \"    $parameter\"
  ";

  	if ($count == $#{$args{'parameterlist'}}) {
  	    print "
  };
  ";
  	    last;
  	}
  	else {
  	    print ", 
  .br
  ";
  	}
  	$count++;
      }
  
      print ".SH Constants
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;
  
  	print ".IP \"".$parameter."\" 12
  ";
  	output_highlight($args{'parameterdescs'}{$parameter_name});
      }
      foreach $section (@{$args{'sectionlist'}}) {
  	print ".SH \"$section\"
  ";
  	output_highlight($args{'sections'}{$section});
      }
  }
  
  ##
  # output struct in man
  sub output_struct_man(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
  
      print ".TH \"$args{'module'}\" 9 \"".$args{'type'}." ".$args{'struct'}."\" \"$man_date\" \"API Manual\" LINUX
  ";
  
      print ".SH NAME
  ";
      print $args{'type'}." ".$args{'struct'}." \\- ".$args{'purpose'}."
  ";
  
      print ".SH SYNOPSIS
  ";
      print $args{'type'}." ".$args{'struct'}." {
  .br
  ";
  
      foreach my $parameter (@{$args{'parameterlist'}}) {
  	if ($parameter =~ /^#/) {
  	    print ".BI \"$parameter\"
  .br
  ";
  	    next;
  	}
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function
  	    print ".BI \"    ".$1."\" ".$parameter." \") (".$2.")"."\"
  ;
  ";
  	} elsif ($type =~ m/^(.*?)\s*(:.*)/) {

  	    # bitfield
  	    print ".BI \"    ".$1."\ \" ".$parameter.$2." \""."\"
  ;
  ";

  	} else {
  	    $type =~ s/([^\*])$/$1 /;
  	    print ".BI \"    ".$type."\" ".$parameter." \""."\"
  ;
  ";
  	}
  	print "
  .br
  ";
      }
      print "};
  .br
  ";

      print ".SH Members
  ";

      foreach $parameter (@{$args{'parameterlist'}}) {
  	($parameter =~ /^#/) && next;
  
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	print ".IP \"".$parameter."\" 12
  ";
  	output_highlight($args{'parameterdescs'}{$parameter_name});
      }
      foreach $section (@{$args{'sectionlist'}}) {
  	print ".SH \"$section\"
  ";
  	output_highlight($args{'sections'}{$section});
      }
  }
  
  ##
  # output typedef in man
  sub output_typedef_man(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
  
      print ".TH \"$args{'module'}\" 9 \"$args{'typedef'}\" \"$man_date\" \"API Manual\" LINUX
  ";
  
      print ".SH NAME
  ";
      print "typedef ".$args{'typedef'}." \\- ".$args{'purpose'}."
  ";
  
      foreach $section (@{$args{'sectionlist'}}) {
  	print ".SH \"$section\"
  ";
  	output_highlight($args{'sections'}{$section});
      }
  }
  
  sub output_intro_man(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
      my $count;
  
      print ".TH \"$args{'module'}\" 9 \"$args{'module'}\" \"$man_date\" \"API Manual\" LINUX
  ";
  
      foreach $section (@{$args{'sectionlist'}}) {
  	print ".SH \"$section\"
  ";
  	output_highlight($args{'sections'}{$section});
      }
  }
  
  ##
  # output in text
  sub output_function_text(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);

      my $start;

      print "Name:
  
  ";
      print $args{'function'}." - ".$args{'purpose'}."
  ";
  
      print "
  Synopsis:
  
  ";

      if ($args{'functiontype'} ne "") {
  	$start = $args{'functiontype'}." ".$args{'function'}." (";
      } else {
  	$start = $args{'function'}." (";
      }

      print $start;

      my $count = 0;
      foreach my $parameter (@{$args{'parameterlist'}}) {
  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function
  	    print $1.$parameter.") (".$2;
  	} else {
  	    print $type." ".$parameter;
  	}
  	if ($count != $#{$args{'parameterlist'}}) {
  	    $count++;
  	    print ",
  ";
  	    print " " x length($start);
  	} else {
  	    print ");
  
  ";
  	}
      }
  
      print "Arguments:
  
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;
  
  	print $parameter."
  \t".$args{'parameterdescs'}{$parameter_name}."
  ";
      }
      output_section_text(@_);
  }
  
  #output sections in text
  sub output_section_text(%) {
      my %args = %{$_[0]};
      my $section;
  
      print "
  ";
      foreach $section (@{$args{'sectionlist'}}) {
  	print "$section:
  
  ";
  	output_highlight($args{'sections'}{$section});

      }

      print "
  
  ";
  }
  
  # output enum in text
  sub output_enum_text(%) {
      my %args = %{$_[0]};
      my ($parameter);
      my $count;
      print "Enum:
  
  ";

      print "enum ".$args{'enum'}." - ".$args{'purpose'}."
  
  ";

      print "enum ".$args{'enum'}." {
  ";
      $count = 0;
      foreach $parameter (@{$args{'parameterlist'}}) {

  	print "\t$parameter";

  	if ($count != $#{$args{'parameterlist'}}) {
  	    $count++;
  	    print ",";
  	}
  	print "
  ";
      }
      print "};
  
  ";
  
      print "Constants:
  
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	print "$parameter
  \t";
  	print $args{'parameterdescs'}{$parameter}."
  ";
      }
  
      output_section_text(@_);
  }
  
  # output typedef in text
  sub output_typedef_text(%) {
      my %args = %{$_[0]};
      my ($parameter);
      my $count;
      print "Typedef:
  
  ";

      print "typedef ".$args{'typedef'}." - ".$args{'purpose'}."
  ";

      output_section_text(@_);
  }
  
  # output struct as text
  sub output_struct_text(%) {
      my %args = %{$_[0]};
      my ($parameter);

      print $args{'type'}." ".$args{'struct'}." - ".$args{'purpose'}."
  
  ";

      print $args{'type'}." ".$args{'struct'}." {
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	if ($parameter =~ /^#/) {
  	    print "$parameter
  ";
  	    next;
  	}
  
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	$type = $args{'parametertypes'}{$parameter};
  	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
  	    # pointer-to-function
  	    print "\t$1 $parameter) ($2);
  ";
  	} elsif ($type =~ m/^(.*?)\s*(:.*)/) {

  	    # bitfield

  	    print "\t$1 $parameter$2;
  ";
  	} else {
  	    print "\t".$type." ".$parameter.";
  ";
  	}
      }
      print "};
  
  ";
  
      print "Members:
  
  ";
      foreach $parameter (@{$args{'parameterlist'}}) {
  	($parameter =~ /^#/) && next;
  
  	my $parameter_name = $parameter;
  	$parameter_name =~ s/\[.*//;

  	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;

  	print "$parameter
  \t";
  	print $args{'parameterdescs'}{$parameter_name}."
  ";
      }
      print "
  ";
      output_section_text(@_);
  }
  
  sub output_intro_text(%) {
      my %args = %{$_[0]};
      my ($parameter, $section);
  
      foreach $section (@{$args{'sectionlist'}}) {
  	print " $section:
  ";
  	print "    -> ";
  	output_highlight($args{'sections'}{$section});
      }
  }
  
  ##

  # generic output function for all types (function, struct/union, typedef, enum);
  # calls the generated, variable output_ function name based on
  # functype and output_mode

  sub output_declaration {
      no strict 'refs';
      my $name = shift;
      my $functype = shift;
      my $func = "output_${functype}_$output_mode";

      if (($function_only==0) ||
  	( $function_only == 1 && defined($function_table{$name})) ||

  	( $function_only == 2 && !defined($function_table{$name})))
      {

  	&$func(@_);

  	$section_counter++;
      }
  }
  
  ##

  # generic output function - calls the right one based on current output mode.

  sub output_intro {
      no strict 'refs';
      my $func = "output_intro_".$output_mode;
      &$func(@_);
      $section_counter++;
  }
  
  ##

  # takes a declaration (struct, union, enum, typedef) and

  # invokes the right handler. NOT called for functions.
  sub dump_declaration($$) {
      no strict 'refs';
      my ($prototype, $file) = @_;
      my $func = "dump_".$decl_type;
      &$func(@_);
  }
  
  sub dump_union($$) {
      dump_struct(@_);
  }
  
  sub dump_struct($$) {
      my $x = shift;
      my $file = shift;
  
      if ($x =~/(struct|union)\s+(\w+)\s*{(.*)}/) {

  	$declaration_name = $2;
  	my $members = $3;

  
  	# ignore embedded structs or unions
  	$members =~ s/{.*?}//g;

  	# ignore members marked private:
  	$members =~ s/\/\*.*?private:.*?public:.*?\*\///gos;
  	$members =~ s/\/\*.*?private:.*//gos;
  	# strip comments:
  	$members =~ s/\/\*.*?\*\///gos;

  	create_parameterlist($members, ';', $file);
  
  	output_declaration($declaration_name,
  			   'struct',
  			   {'struct' => $declaration_name,
  			    'module' => $modulename,
  			    'parameterlist' => \@parameterlist,
  			    'parameterdescs' => \%parameterdescs,
  			    'parametertypes' => \%parametertypes,
  			    'sectionlist' => \@sectionlist,
  			    'sections' => \%sections,
  			    'purpose' => $declaration_purpose,
  			    'type' => $decl_type
  			   });
      }
      else {

  	print STDERR "Error(${file}:$.): Cannot parse struct or union!
  ";

  	++$errors;
      }
  }
  
  sub dump_enum($$) {
      my $x = shift;
      my $file = shift;

      $x =~ s@/\*.*?\*/@@gos;	# strip comments.

      if ($x =~ /enum\s+(\w+)\s*{(.*)}/) {

  	$declaration_name = $1;
  	my $members = $2;

  
  	foreach my $arg (split ',', $members) {
  	    $arg =~ s/^\s*(\w+).*/$1/;
  	    push @parameterlist, $arg;
  	    if (!$parameterdescs{$arg}) {

  		$parameterdescs{$arg} = $undescribed;
  		print STDERR "Warning(${file}:$.): Enum value '$arg' ".

  		    "not described in enum '$declaration_name'
  ";
  	    }
  
  	}

  	output_declaration($declaration_name,
  			   'enum',
  			   {'enum' => $declaration_name,
  			    'module' => $modulename,
  			    'parameterlist' => \@parameterlist,
  			    'parameterdescs' => \%parameterdescs,
  			    'sectionlist' => \@sectionlist,
  			    'sections' => \%sections,
  			    'purpose' => $declaration_purpose
  			   });
      }
      else {

  	print STDERR "Error(${file}:$.): Cannot parse enum!
  ";

  	++$errors;
      }
  }
  
  sub dump_typedef($$) {
      my $x = shift;
      my $file = shift;

      $x =~ s@/\*.*?\*/@@gos;	# strip comments.

      while (($x =~ /\(*.\)\s*;$/) || ($x =~ /\[*.\]\s*;$/)) {

  	$x =~ s/\(*.\)\s*;$/;/;

  	$x =~ s/\[*.\]\s*;$/;/;
      }
  
      if ($x =~ /typedef.*\s+(\w+)\s*;/) {

  	$declaration_name = $1;

  
  	output_declaration($declaration_name,
  			   'typedef',
  			   {'typedef' => $declaration_name,
  			    'module' => $modulename,
  			    'sectionlist' => \@sectionlist,
  			    'sections' => \%sections,
  			    'purpose' => $declaration_purpose
  			   });
      }
      else {

  	print STDERR "Error(${file}:$.): Cannot parse typedef!
  ";

  	++$errors;
      }
  }
  
  sub create_parameterlist($$$) {
      my $args = shift;
      my $splitter = shift;
      my $file = shift;
      my $type;
      my $param;

      # temporarily replace commas inside function pointer definition

      while ($args =~ /(\([^\),]+),/) {

  	$args =~ s/(\([^\),]+),/$1#/g;

      }

      foreach my $arg (split($splitter, $args)) {
  	# strip comments
  	$arg =~ s/\/\*.*\*\///;

  	# strip leading/trailing spaces
  	$arg =~ s/^\s*//;

  	$arg =~ s/\s*$//;
  	$arg =~ s/\s+/ /;
  
  	if ($arg =~ /^#/) {
  	    # Treat preprocessor directive as a typeless variable just to fill
  	    # corresponding data structures "correctly". Catch it later in
  	    # output_* subs.
  	    push_parameter($arg, "", $file);

  	} elsif ($arg =~ m/\(.*\*/) {

  	    # pointer-to-function
  	    $arg =~ tr/#/,/;

  	    $arg =~ m/[^\(]+\(\*\s*([^\)]+)\)/;

  	    $param = $1;
  	    $type = $arg;
  	    $type =~ s/([^\(]+\(\*)$param/$1/;
  	    push_parameter($param, $type, $file);

  	} elsif ($arg) {

  	    $arg =~ s/\s*:\s*/:/g;
  	    $arg =~ s/\s*\[/\[/g;
  
  	    my @args = split('\s*,\s*', $arg);
  	    if ($args[0] =~ m/\*/) {
  		$args[0] =~ s/(\*+)\s*/ $1/;
  	    }

  
  	    my @first_arg;
  	    if ($args[0] =~ /^(.*\s+)(.*?\[.*\].*)$/) {
  		    shift @args;
  		    push(@first_arg, split('\s+', $1));
  		    push(@first_arg, $2);
  	    } else {
  		    @first_arg = split('\s+', shift @args);
  	    }

  	    unshift(@args, pop @first_arg);
  	    $type = join " ", @first_arg;
  
  	    foreach $param (@args) {
  		if ($param =~ m/^(\*+)\s*(.*)/) {
  		    push_parameter($2, "$type $1", $file);
  		}
  		elsif ($param =~ m/(.*?):(\d+)/) {
  		    push_parameter($1, "$type:$2", $file)
  		}
  		else {
  		    push_parameter($param, $type, $file);
  		}
  	    }
  	}
      }
  }
  
  sub push_parameter($$$) {
  	my $param = shift;
  	my $type = shift;
  	my $file = shift;

  	if (($anon_struct_union == 1) && ($type eq "") &&
  	    ($param eq "}")) {
  		return;		# ignore the ending }; from anon. struct/union
  	}
  
  	$anon_struct_union = 0;

  	my $param_name = $param;
  	$param_name =~ s/\[.*//;

  	if ($type eq "" && $param =~ /\.\.\.$/)

  	{
  	    $type="";

  	    $parameterdescs{$param} = "variable arguments";

  	}
  	elsif ($type eq "" && ($param eq "" or $param eq "void"))
  	{
  	    $type="";
  	    $param="void";
  	    $parameterdescs{void} = "no arguments";
  	}

  	elsif ($type eq "" && ($param eq "struct" or $param eq "union"))
  	# handle unnamed (anonymous) union or struct:
  	{
  		$type = $param;

  		$param = "{unnamed_" . $param . "}";

  		$parameterdescs{$param} = "anonymous
  ";

  		$anon_struct_union = 1;

  	}

  	# warn if parameter has no description

  	# (but ignore ones starting with # as these are not parameters
  	# but inline preprocessor statements);
  	# also ignore unnamed structs/unions;

  	if (!$anon_struct_union) {

  	if (!defined $parameterdescs{$param_name} && $param_name !~ /^#/) {

  	    $parameterdescs{$param_name} = $undescribed;
  
  	    if (($type eq 'function') || ($type eq 'enum')) {

  		print STDERR "Warning(${file}:$.): Function parameter ".

  		    "or member '$param' not " .
  		    "described in '$declaration_name'
  ";
  	    }
  	    print STDERR "Warning(${file}:$.):".

  			 " No description found for parameter '$param'
  ";

  	    ++$warnings;

  	}
  	}

  
  	push @parameterlist, $param;
  	$parametertypes{$param} = $type;
  }
  
  ##
  # takes a function prototype and the name of the current file being
  # processed and spits out all the details stored in the global
  # arrays/hashes.
  sub dump_function($$) {
      my $prototype = shift;
      my $file = shift;
  
      $prototype =~ s/^static +//;
      $prototype =~ s/^extern +//;

      $prototype =~ s/^fastcall +//;
      $prototype =~ s/^asmlinkage +//;

      $prototype =~ s/^inline +//;
      $prototype =~ s/^__inline__ +//;

      $prototype =~ s/^__inline +//;
      $prototype =~ s/^__always_inline +//;
      $prototype =~ s/^noinline +//;

      $prototype =~ s/__devinit +//;

      $prototype =~ s/^#define\s+//; #ak added

      $prototype =~ s/__attribute__\s*\(\([a-z,]*\)\)//;

  
      # Yes, this truly is vile.  We are looking for:
      # 1. Return type (may be nothing if we're looking at a macro)
      # 2. Function name
      # 3. Function parameters.
      #
      # All the while we have to watch out for function pointer parameters
      # (which IIRC is what the two sections are for), C types (these
      # regexps don't even start to express all the possibilities), and
      # so on.
      #
      # If you mess with these regexps, it's a good idea to check that
      # the following functions' documentation still comes out right:
      # - parport_register_device (function pointer parameters)
      # - atomic_set (macro)

      # - pci_match_device, __copy_to_user (long return type)

  
      if ($prototype =~ m/^()([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^(\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^(\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
  	$prototype =~ m/^()([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||

  	$prototype =~ m/^(\w+\s+\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||

  	$prototype =~ m/^(\w+\s+\w+\s+\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
  	$prototype =~ m/^(\w+\s+\w+\s*\*\s*\w+\s*\*\s*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/)  {

  	$return_type = $1;
  	$declaration_name = $2;
  	my $args = $3;
  
  	create_parameterlist($args, ',', $file);
      } else {
  	print STDERR "Error(${file}:$.): cannot understand prototype: '$prototype'
  ";
  	++$errors;
  	return;
      }

      output_declaration($declaration_name,

  		       'function',
  		       {'function' => $declaration_name,
  			'module' => $modulename,
  			'functiontype' => $return_type,
  			'parameterlist' => \@parameterlist,
  			'parameterdescs' => \%parameterdescs,
  			'parametertypes' => \%parametertypes,
  			'sectionlist' => \@sectionlist,
  			'sections' => \%sections,
  			'purpose' => $declaration_purpose
  		       });
  }
  
  sub process_file($);
  
  # Read the file that maps relative names to absolute names for
  # separate source and object directories and for shadow trees.
  if (open(SOURCE_MAP, "<.tmp_filelist.txt")) {
  	my ($relname, $absname);
  	while(<SOURCE_MAP>) {
  		chop();
  		($relname, $absname) = (split())[0..1];
  		$relname =~ s:^/+::;
  		$source_map{$relname} = $absname;
  	}
  	close(SOURCE_MAP);
  }
  
  if ($filelist) {
  	open(FLIST,"<$filelist") or die "Can't open file list $filelist";
  	while(<FLIST>) {
  		chop;
  		process_file($_);
  	}
  }
  
  foreach (@ARGV) {
      chomp;
      process_file($_);
  }
  if ($verbose && $errors) {
    print STDERR "$errors errors
  ";
  }
  if ($verbose && $warnings) {
    print STDERR "$warnings warnings
  ";
  }
  
  exit($errors);
  
  sub reset_state {
      $function = "";
      %constants = ();
      %parameterdescs = ();
      %parametertypes = ();
      @parameterlist = ();
      %sections = ();
      @sectionlist = ();
      $prototype = "";

      $state = 0;
  }

  sub process_state3_function($$) {

      my $x = shift;
      my $file = shift;

      $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line

      if ($x =~ m#\s*/\*\s+MACDOC\s*#io || ($x =~ /^#/ && $x !~ /^#define/)) {
  	# do nothing
      }
      elsif ($x =~ /([^\{]*)/) {

  	$prototype .= $1;

      }
      if (($x =~ /\{/) || ($x =~ /\#define/) || ($x =~ /;/)) {

  	$prototype =~ s@/\*.*?\*/@@gos;	# strip comments.

  	$prototype =~ s@[\r
  ]+@ @gos; # strip newlines/cr's.
  	$prototype =~ s@^\s+@@gos; # strip leading spaces
  	dump_function($prototype,$file);
  	reset_state();
      }
  }

  sub process_state3_type($$) {

      my $x = shift;
      my $file = shift;

      $x =~ s@[\r
  ]+@ @gos; # strip newlines/cr's.
      $x =~ s@^\s+@@gos; # strip leading spaces
      $x =~ s@\s+$@@gos; # strip trailing spaces

      $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line

      if ($x =~ /^#/) {
  	# To distinguish preprocessor directive from regular declaration later.
  	$x .= ";";
      }
  
      while (1) {

  	if ( $x =~ /([^{};]*)([{};])(.*)/ ) {

  	    $prototype .= $1 . $2;
  	    ($2 eq '{') && $brcount++;
  	    ($2 eq '}') && $brcount--;
  	    if (($2 eq ';') && ($brcount == 0)) {

  		dump_declaration($prototype,$file);

  		reset_state();

  		last;

  	    }
  	    $x = $3;

  	} else {

  	    $prototype .= $x;
  	    last;
  	}
      }
  }
  
  # replace <, >, and &
  sub xml_escape($) {
  	my $text = shift;

  	if (($output_mode eq "text") || ($output_mode eq "man")) {
  		return $text;
  	}

  	$text =~ s/\&/\\\\\\amp;/g;
  	$text =~ s/\</\\\\\\lt;/g;
  	$text =~ s/\>/\\\\\\gt;/g;
  	return $text;
  }
  
  sub process_file($) {

      my $file;

      my $identifier;
      my $func;

      my $descr;

      my $initial_section_counter = $section_counter;

      if (defined($ENV{'SRCTREE'})) {
  	$file = "$ENV{'SRCTREE'}" . "/" . "@_";
      }
      else {
  	$file = "@_";
      }

      if (defined($source_map{$file})) {
  	$file = $source_map{$file};
      }
  
      if (!open(IN,"<$file")) {
  	print STDERR "Error: Cannot open file $file
  ";
  	++$errors;
  	return;
      }
  
      $section_counter = 0;
      while (<IN>) {
  	if ($state == 0) {
  	    if (/$doc_start/o) {
  		$state = 1;		# next line is always the function name

  		$in_doc_sect = 0;

  	    }
  	} elsif ($state == 1) {	# this line is the function name (always)
  	    if (/$doc_block/o) {
  		$state = 4;
  		$contents = "";
  		if ( $1 eq "" ) {
  			$section = $section_intro;
  		} else {
  			$section = $1;
  		}

  	    }

  	    elsif (/$doc_decl/o) {
  		$identifier = $1;
  		if (/\s*([\w\s]+?)\s*-/) {
  		    $identifier = $1;
  		}
  
  		$state = 2;
  		if (/-(.*)/) {

  		    # strip leading/trailing/multiple spaces

  		    $descr= $1;
  		    $descr =~ s/^\s*//;
  		    $descr =~ s/\s*$//;
  		    $descr =~ s/\s+/ /;
  		    $declaration_purpose = xml_escape($descr);

  		} else {
  		    $declaration_purpose = "";
  		}
  		if ($identifier =~ m/^struct/) {
  		    $decl_type = 'struct';
  		} elsif ($identifier =~ m/^union/) {
  		    $decl_type = 'union';
  		} elsif ($identifier =~ m/^enum/) {
  		    $decl_type = 'enum';
  		} elsif ($identifier =~ m/^typedef/) {
  		    $decl_type = 'typedef';
  		} else {
  		    $decl_type = 'function';
  		}
  
  		if ($verbose) {
  		    print STDERR "Info(${file}:$.): Scanning doc for $identifier
  ";
  		}
  	    } else {
  		print STDERR "Warning(${file}:$.): Cannot understand $_ on line $.",
  		" - I thought it was a doc line
  ";
  		++$warnings;
  		$state = 0;
  	    }
  	} elsif ($state == 2) {	# look for head: lines, and include content
  	    if (/$doc_sect/o) {
  		$newsection = $1;
  		$newcontents = $2;
  
  		if ($contents ne "") {

  		    if (!$in_doc_sect && $verbose) {
  			print STDERR "Warning(${file}:$.): contents before sections
  ";
  			++$warnings;
  		    }

  		    dump_section($section, xml_escape($contents));
  		    $section = $section_default;
  		}

  		$in_doc_sect = 1;

  		$contents = $newcontents;
  		if ($contents ne "") {

  		    while ((substr($contents, 0, 1) eq " ") ||
  			substr($contents, 0, 1) eq "\t") {
  			    $contents = substr($contents, 1);

  		    }

  		    $contents .= "
  ";
  		}
  		$section = $newsection;
  	    } elsif (/$doc_end/) {
  
  		if ($contents ne "") {
  		    dump_section($section, xml_escape($contents));
  		    $section = $section_default;
  		    $contents = "";
  		}
  
  		$prototype = "";
  		$state = 3;
  		$brcount = 0;

  #		print STDERR "end of doc comment, looking for prototype
  ";

  	    } elsif (/$doc_content/) {
  		# miguel-style comment kludge, look for blank lines after
  		# @parameter line to signify start of description

  		if ($1 eq "" &&

  			($section =~ m/^@/ || $section eq $section_context)) {
  		    dump_section($section, xml_escape($contents));
  		    $section = $section_default;
  		    $contents = "";
  		} else {
  		    $contents .= $1."
  ";
  		}
  	    } else {
  		# i dont know - bad line?  ignore.

  		print STDERR "Warning(${file}:$.): bad line: $_";

  		++$warnings;
  	    }

  	} elsif ($state == 3) {	# scanning for function '{' (end of prototype)

  	    if ($decl_type eq 'function') {

  		process_state3_function($_, $file);

  	    } else {

  		process_state3_type($_, $file);

  	    }
  	} elsif ($state == 4) {
  		# Documentation block

  		if (/$doc_block/) {

  			dump_section($section, $contents);
  			output_intro({'sectionlist' => \@sectionlist,
  				      'sections' => \%sections });
  			$contents = "";
  			$function = "";
  			%constants = ();
  			%parameterdescs = ();
  			%parametertypes = ();
  			@parameterlist = ();
  			%sections = ();
  			@sectionlist = ();
  			$prototype = "";
  			if ( $1 eq "" ) {
  				$section = $section_intro;
  			} else {
  				$section = $1;
  			}

  		}

  		elsif (/$doc_end/)
  		{
  			dump_section($section, $contents);
  			output_intro({'sectionlist' => \@sectionlist,
  				      'sections' => \%sections });
  			$contents = "";
  			$function = "";
  			%constants = ();
  			%parameterdescs = ();
  			%parametertypes = ();
  			@parameterlist = ();
  			%sections = ();
  			@sectionlist = ();
  			$prototype = "";
  			$state = 0;
  		}
  		elsif (/$doc_content/)
  		{
  			if ( $1 eq "" )
  			{
  				$contents .= $blankline;
  			}
  			else
  			{
  				$contents .= $1 . "
  ";

  			}

  		}
  	}

      }
      if ($initial_section_counter == $section_counter) {
  	print STDERR "Warning(${file}): no structured comments found
  ";
  	if ($output_mode eq "xml") {
  	    # The template wants at least one RefEntry here; make one.
  	    print "<refentry>
  ";
  	    print " <refnamediv>
  ";
  	    print "  <refname>
  ";
  	    print "   ${file}
  ";
  	    print "  </refname>
  ";
  	    print "  <refpurpose>
  ";
  	    print "   Document generation inconsistency
  ";
  	    print "  </refpurpose>
  ";
  	    print " </refnamediv>
  ";
  	    print " <refsect1>
  ";
  	    print "  <title>
  ";
  	    print "   Oops
  ";
  	    print "  </title>
  ";
  	    print "  <warning>
  ";
  	    print "   <para>
  ";
  	    print "    The template for this document tried to insert
  ";
  	    print "    the structured comment from the file
  ";
  	    print "    <filename>${file}</filename> at this point,
  ";
  	    print "    but none was found.
  ";
  	    print "    This dummy section is inserted to allow
  ";
  	    print "    generation to continue.
  ";
  	    print "   </para>
  ";
  	    print "  </warning>
  ";
  	    print " </refsect1>
  ";
  	    print "</refentry>
  ";
  	}
      }
  }